Shenzhen North Station is located in Zhi Min, Longhua (the red circle below is the special inspection building and the blue circle is Shenzhen North Station).
You can take the bus and transfer to Shenzhen North Station at the bus stop near the special inspection building.
Take No.4 or No.85 sightseeing bus to Buji Street Station at the Armed Police Hospital Station near the special inspection building.
When you arrive at Buji Street Bus Station, walk for 3 minutes to the nearby Buji subway station (Buji subway station and Shenzhen East Station are together).
When you get to Buji subway station, take Line 5 (Central Line) and take the train to Qianwan?
Take 8 stops to "Shenzhen North Station" (namely Shenzhen North high-speed railway station) for about 20 minutes.